Error when creating a folder in a webmail

Problem reported by SEIT - 7/16/2026 at 6:17 AM

Submitted

Hello Everyone,

I've been encountering this error in the webmail when i try to create a new folder.

"Cannot read properties of undefined (reading 'length')"

How do I solve that? Happens to be only on a specific email address and not server-wide or domain wide.

2 Replies

Reply to Thread

Linda Pagillo Replied

Yesterday at 1:18 PM

Hey SEIT. I grabbed this from Google. Perhaps it may help...

The "Cannot read properties of undefined (reading 'length')" error in SmarterMail typically occurs when the web interface attempts to evaluate a variable or array that hasn't loaded or returned any data yet (a standard JavaScript issue).

Here is how to isolate and resolve it:

Clear your Browser Cache: Corrupted temporary files in your web browser often cause interface rendering errors in SmarterMail.

Use a Different Browser: Test the interface on Chrome, Firefox, or Edge using an Incognito/Private window. If it works, the issue is strictly local to your browser profile.

Check for Plugin/Extension Interference: Ad-blockers or script-blockers can block core SmarterMail JavaScript files from running, triggering this exact error.

Update SmarterMail: Known scripting and interface bugs are continuously addressed by SmarterTools. Ensure your server administrator has the latest SmarterMail updates installed.

Plesk Integration: If you are managing SmarterMail through Plesk, this error is a known bug associated with domain creation and webspace mapping. It is resolved by ensuring your Plesk SmarterMail components are up to date.

Linda Pagillo
Mail's Best Friend
Email: linda.pagillo@mailsbestfriend.com
Web: www.mailsbestfriend.com

Authorized SmarterTools Reseller

Authorized Message Sniffer Reseller

CLEBER SAAD Replied

Yesterday at 2:02 PM

Hello,

Open a ticket and send more information like the email address and another errors (like F12 - Developer Chrome extension) and get the return of the API (SM it's all API calls)

Back to Community Threads

Please leave this box unchecked

Reply to Thread

Enter the verification text